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M31N 2008-12a - the remarkable recurrent nova in M31: Pan-Chromatic observations of the 2015 eruption | | M. J. Darnley
; M. Henze
; M. F. Bode
; I. Hachisu
; M. Hernanz
; K. Hornoch
; R. Hounsell
; M. Kato
; J.-U. Ness
; J. P. Osborne
; K. L. Page
; V. A. R. M. Ribeiro
; P. Rodriguez-Gil
; A. W. Shafter
; M. M. Shara
; I. A. Steele
; S. C. Williams
; A. Arai
; I. Arcavi
; E. A. Barsukova
; P. Boumis
; T. Chen
; S. Fabrika
; J. Figueira
; N. Gehrels
; P. Godon
; V. P. Goranskij
; D. J. Harman
; D. H. Hartmann
; G. Hosseinzadeh
; J. Chuck Horst
; K. Itagaki
; J. Jose
; F. Kabashima
; A. Kaur
; N. Kawai
; J. A. Kennea
; S. Kiyota
; H. Kucakova
; K. M. Lau
; H. Maehara
; H. Naito
; K. Nakajima
; K. Nishiyama
; T. J. O'Brien
; R. Quimby
; G. Sala
; Y. Sano
; E. M. Sion
; A. F. Valeev
; F. Watanabe
; M. Watanabe
; B. F. Williams
; Z. Xu
; | | Date: |
27 Jul 2016 | | Abstract: | The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in
eruption ten times, including yearly eruptions from 2008-2014. With a measured
recurrence period of $P_mathrm{rec}=351pm13$ days (we believe the true value
to be half of this) and a white dwarf very close to the Chandrasekhar limit,
M31N 2008-12a has become the leading pre-explosion supernova type Ia progenitor
candidate. Following multi-wavelength follow-up observations of the 2013 and
2014 eruptions, we initiated a campaign to ensure early detection of the
predicted 2015 eruption, which triggered ambitious ground and space-based
follow-up programs. In this paper we present the 2015 detection; visible to
near-infrared photometry and visible spectroscopy; and ultraviolet and X-ray
observations from the Swift observatory. The LCOGT 2m (Hawaii) discovered the
2015 eruption, estimated to have commenced at Aug. $28.28pm0.12$ UT. The
2013-2015 eruptions are remarkably similar at all wavelengths. New early
spectroscopic observations reveal short-lived emission from material with
velocities $sim13000$ km s$^{-1}$, possibly collimated outflows. Photometric
and spectroscopic observations of the eruption provide strong evidence
supporting a red giant donor. An apparently stochastic variability during the
early super-soft X-ray phase was comparable in amplitude and duration to past
eruptions, but the 2013 and 2015 eruptions show evidence of a brief flux dip
during this phase. The multi-eruption Swift/XRT spectra show tentative evidence
of high-ionization emission lines above a high-temperature continuum. Following
Henze et al. (2015a), the updated recurrence period based on all known
eruptions is $P_mathrm{rec}=174pm10$ d, and we expect the next eruption of
M31N 2008-12a to occur around mid-Sep. 2016. | | Source: | arXiv, 1607.8082 | | Services: | Forum | Review | PDF | Favorites | |
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